Office chair



FIG. 1 is a perspective view of the office chair showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The darker broken lines shown on the backrest and seat represent stitching, other lighter broken lines in the drawing illustrate portions of the office chair that form no part of the claimed design. 

CLAIM The ornamental design for office chair, as shown and described. 